The P1703 trouble code is a diagnostic trouble code (DTC) that indicates a communication issue related to the brake switch or the brake pedal position sensor in various vehicles. This code is particularly prevalent in Ford models but can also appear in other manufacturers’ vehicles. When the vehicle’s Engine Control Module (ECM) detects that the brake switch signal is out of range during its self-test, it triggers the P1703 code. This can lead to various symptoms, including warning lights on the dashboard and potential issues with braking performance.
| P1703 Code Meaning | P1703 Code Common Causes |
|---|---|
| Brake Switch Out of Self-Test Range | Faulty brake pedal position switch |
| Communication Error with Brake Control Module | Wiring issues or shorts in the brake system |
| Intermittent Signal from Brake Switch | Corroded connectors or damaged wiring harness |
| Brake Light Malfunction | Faulty brake light bulbs or circuits |
| ECM or PCM Faults | Defective Engine Control Module or Powertrain Control Module |
Symptoms of P1703 Code
- Warning Lights: The most common symptom is the illumination of the brake warning light on the dashboard.
- Brake Performance Issues: Drivers may experience excessive pressure needed on the brake pedal or inconsistent braking response.
- Cruise Control Malfunction: In some cases, the cruise control system may not function properly due to the brake switch error.
- Diagnostic Trouble Codes: Additional codes may be present alongside P1703, indicating related issues within the braking system.
Technical Explanations
The P1703 code typically arises during a Key On Engine Off (KOEO) self-test when the ECM checks for proper operation of various components, including the brake switch. If it detects that the signal from the brake switch is continuously high or out of expected parameters, it will set this code.
The brake pedal position switch is crucial for informing the ECM when the brakes are applied. This information is vital for systems like anti-lock brakes (ABS) and cruise control, which rely on accurate readings to function correctly.
Step-by-Step Diagnosis
- Scan for Codes: Use an OBD-II scanner to confirm that P1703 is present and check for any additional codes that might provide more context.
- Visual Inspection: Inspect wiring and connectors associated with the brake pedal position switch for signs of corrosion, damage, or loose connections.
- Test Brake Switch: With a multimeter, check the continuity of the brake switch. It should show continuity when the pedal is pressed and none when released.
- Check Brake Lights: Ensure that all brake lights are functioning correctly. A malfunctioning bulb can sometimes trigger this code.
- Inspect ECM/PCM: If all components test fine, consider checking for faults in the ECM or PCM using manufacturer-specific diagnostic tools.
Solution Methods
- Replace Brake Switch: If testing indicates a faulty brake switch, replace it with a new part. Ensure proper alignment and connection to avoid future issues.
- Repair Wiring Issues: Address any damaged wiring or corroded connectors found during inspection. Use electrical cleaner and heat-shrink tubing for repairs where necessary.
- Check Fuses and Relays: Inspect relevant fuses and relays in the braking system circuit to ensure they are functioning correctly.
- Reprogram ECM/PCM: If all else fails, reprogramming or replacing the ECM/PCM may be necessary if it is determined to be faulty.
Cost Estimates
- Brake Switch Replacement: Approximately $50 – $150 depending on vehicle make and model.
- Wiring Repairs: Costs can vary widely; expect between $100 – $300 based on labor rates and extent of damage.
- ECM/PCM Replacement: This can be quite expensive, ranging from $500 – $1500 including parts and labor depending on vehicle complexity.
Warnings and Recommendations
- Always disconnect the battery before working on electrical components to prevent shorts or accidental airbag deployment.
- If you are not comfortable diagnosing electrical issues, seek professional help to avoid further complications.
- Regular maintenance of your vehicle’s electrical systems can prevent many issues related to DTCs like P1703 from occurring.
Frequently Asked Questions About P1703
- What does P1703 mean?
P1703 indicates a communication error related to the brake switch signal being out of range during self-tests. - Can I drive my car with a P1703 code?
While you can drive with this code, it may affect your braking performance; it’s advisable to address it promptly. - How do I reset a P1703 code?
You can reset the code by clearing it with an OBD-II scanner after addressing any underlying issues. - What are common symptoms of a faulty brake switch?
Common symptoms include warning lights on the dashboard and inconsistent braking performance. - Is P1703 specific to Ford vehicles?
No, while it’s common in Ford models, other manufacturers may also use this code for similar issues. - How much does it cost to fix a P1703?
The cost can range from $50 for a simple switch replacement to over $1500 for PCM replacement. - Can I fix P1703 myself?
If you have basic mechanical skills and tools, you can diagnose and potentially fix it yourself; otherwise, consult a professional. - What should I do if my cruise control stops working?
If your cruise control fails along with a P1703 code, inspect your brake system as it may be linked to the issue.
In conclusion, understanding and addressing the P1703 trouble code is essential for maintaining your vehicle’s safety and performance. By following systematic diagnostic steps and implementing effective solutions, vehicle owners and DIY mechanics can resolve this issue efficiently. Always prioritize safety by consulting professionals when needed, especially when dealing with critical systems like braking.